Means for fastening arms, levers, or pulleys to shafts or stems.



Patented Dec. l0, l90l; C. J. PB

INTZ. S, 03 PULLEYS T0 SHA'FTS 0B STEMS.

ed Feb. 13, 1901.)

MEANS FOR FASTENING ARMS, LE

(Application UNITED STATES PATENT EETcE.

CARL J. PRINTZ, OF MILWAUKEE, VVISOONSIN.

SPECIFICATION forming part of Letters Patent No. 688,687,

dated December 10, 1901.

Application filed February 13, 1901. Serial No. 47,104. (No model.)

To aZZ whom it may concern.-

Be it known that I, CARL J. PRINTZ, residing in Milwaukee, in the countyof Milwaukee and State of IVisconsin, have invented a new and usefulImprovement in Means for Fastening Arms, Levers, or Pulleys to Shafts orStems, of which the following is a description, reference being had tothe accompanying drawings, which are a part ofthis specifieation.

My invention has relation to improvements in means for fastening arms,levers, or pulleys to shafts or stems.

The invention has for its object the production of a strong and simpledevice for fastening arms, levers, or pulleys to oscillating orrevolving shafts or stems; and with this primary object in View theinvention consists of the devices and parts or their equivalents, ashereinafter more fully set forth.

In the accompanying drawings, Figure l is a sectional side View throughthe center of the arm, lever, or pulley, showing the same connected to ashaft or stem by means of my device. Fig. 2 is a transverse sectionthrough the shaft in order to illustrate the key-seat. Fig. 3 is adetail View of the key. Fig. 4 is a detail View of the modified form ofkey. Fig. 5 is a similar view to Fig. 1 of a modified form ofconstruction. Fig. 6 is a transverse section through the shaftillustrated in Fig. 5. Fig. 7 is an end View of Fig. 5 with the keyomitted. Fig. 8 is a similar view to Figs. 1 and 5 of still anothermodified form of construction. Fig. 9 is a transverse section throughthe shaft shown in Fig. 8, and Fig. 10 is a detail View of the follower.

Referring to the drawings, the numeral 11 throughout the several viewsindicates a shaft or stem, and 12 the arm, lover, or pulley securedthereto. The opening of the arm, lever, or pulley through which theshaft or stem passes is provided with a wedge-shaped key-seat 13, whichreceives the tapered or inclined face of a wedge-key 14. I prefer thatthe opposite straight face of the key be fitted in a recess 15, forminga key-seat in the shaft or stem. In all the several forms ofconstruction illustrated one end of the key projects outwardly beyondone side of the arm, lever, or pulley, and the outer face of this pro- 7provided with jecting portion is provided with a series of teeth 17. v

In Fig.1 a nut 18 is shown as surrounding the shaft 11 and has threadedcontact with the projecting threaded end of the key. By the turning ofthis nut in the proper direction the keyof course is drawn into tightwedging engagement with the key-seat 13, being permitted to slide in thekey-seat 15.

In the modified form of construction illustrated in Figs. 5 and 7 thehub of the arm, lever, or pulley is provided with an integral extension19, having a space 19 therethrough for the accommodation of theprojecting threaded portion of the key, so that the threads may beexposed, and thereby adapted to be engaged by the nut. Surrounding thisextension is the nut 18. By providing this extension 19 I am enabled tomake the projecting threaded portion of the key 14 considerably thickerthan in the form shown in Fig. 1, and hence strength is thereby subserved. If desired, in the Figs. 5 and 7 form of construction thenecessity for forming a key-seat in the shaft may be avoided by adoptingthe form of key illustrated in Fig. i of the drawings and designated bythe numeral 14, said key having its straight face projecting knife-edges16 16, which engage the surface of the shaft.

In the modified form illustrated in Fig. 8 the integral extension 19 isomitted and in lieu thereof a follower 20 is provided. This followerconsists of a split exteriorly-threaded ringorannulusfittingtheshaft.Thenut18is in threaded contact with the follower and key, and hence whenturned will draw the key into tight wedgingengagementwith the arm,lever,or pulley. The split portion of the ringiis for the accommodation of theprojecting end of the key, the threads of said projecting end beingthereby also permitted to be engaged by the nut. By this modified formof construction the projecting end of the key is also permitted to bemade of considerable thickness, the same as in the Fig. 5 form; but thenecessity of providing the arm, lever, or pulley with an integralextension 19 is avoided.

It will be understood that if hammer motion,

or, in other Words, a sudden-stop motion, is desired the thread may beright or left hand,

as the case may be, in order to make the nut self-tightening.

From the above description it will be seen that I provide a simple andinexpensive device for the purpose intended, capable of effecting a mostsecure and effective fastening of an arm, lever, or pulley to a shaft orstem.

Considerable trouble has heretofore been experienced in devising asuitable means for securely fastening the so-called steam-arm in Corlissengines, or the arm or lever which is fastened to the stem driving thesteam or inlet valve on a Corliss steam-engine. It will be found that myinvention may be used to special advantage in this connection.

What I claim as my invention is 1. In a fastening device, thecombination of a shaft, a device to be fastened mounted on the shaft, akey fitting between the shaft and the device to be fastened in asuitable key-seat therefor, said key having a projecting threadedend,said projecting threaded end being substantially flat, incross-section, and a nut concentrically surrounding the shaft, andreceiving therein the threaded projection of the key, the nut being inthreaded engagement with the threaded projection of the key.

2. In a fastening device,,the combination of a shaft, adevice to befastened mounted on the shaft, a tapering key fitting between the shaftand the device to be fastened, in a suitable key-seat therefor said keyhaving a projecting threaded end, said projecting threaded end beingsubstantially flat, in cross-section, and a nut concentricallysurrounding the shaft, and receiving therein the threaded projection ofthe key, the nut being in threaded engagement with the threadedprojection.

3. In a fastening device, the combination of a shaft, a device to befastened mounted on the shaft, a key fitting between the shaft and thedevice to be fastened, in a suitable keyseat therefor, said key havingone end thread= ed, a nut engaging the threads of theend of the key, anda part interposed between said nut and the shaft. p

4. In a fastening device, the combination of a shaft, a device to befastened mounted on the shaft, a key fitting between the shaft and thedevice to be fastened in a suitable keyseat therefor, said key havingone end threaded, a follower surrounding the shaft, and consisting of asplit ring, the split portion thereof receiving therein the threaded endof the key, and a nut surrounding the follower and engaging the threadsof the key.

5. In a fastening device, the combination of a shaft, a device to befastened mounted on the shaft, a key fitting between the shaft and thedevice, to be fastened, in a suitable keyseat therefor, said key havingone end thread ed, a follower surrounding the shaft, and consisting ofan exteriorly-threaded split ring, the split portion thereof receivingtherein the threaded end of the key, and a nut engaging the threads ofthe follower and of the key.

In testimony whereof I affix my signature in presence of two witnesses.

CARL J. PRINTZ.

IVitnesses:

A. L. MORSELL, ANNA V. FAUST.

